Seedbank responses to spring and fall prescribed fire in mountain big sagebrush ecosystems of differing ecological condition at Lava Beds National Monument,California |
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| Institution: | 1. Department of Veterinary Parasitology, Islamic Azad University, Babol Branch, Babol, Iran;2. Young Researcher Club, Islamic Azad University, Babol Branch, Babol, Iran;3. Student Research Committee, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran;1. Department of Vertebrate Zoology, Faculty of Biology, St. Petersburg State University, Universitetskaya Emb. 7/9, St. Petersburg, 199034, Russia;2. Vavilov Institute of General Genetics RAS, Gubkina St. 3, Moscow, 119991, Russia;3. Theodosius Dobzhansky Center for Genome Bioinformatics, St. Petersburg State University, Sredny Ave. 41, St. Petersburg, 199004, Russia;4. Russian State Agrarian University Moscow Timiryazev Agricultural Academy, Timiryazevskaya St. 49, Moscow, 127550, Russia;5. Kamchatka Branch of Pacific Institute of Geography FEB RAS, Rybakov Ave. 19-a, Petropavlovsk-Kamchatsky, 683024, Russia;6. Whale and Dolphin Conservation, Park House, Allington Park, Bridport, Dorset DT6 5DD, UK;1. Department of Statistics, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China;2. College of Applied Sciences, Beijing University of Technology, Beijing, 100124, China;3. School of Mathematics and Statistics, Zhengzhou University, Zhengzhou, 450001, China;1. Lomonosov Moscow State University, Faculty of History, Department of Archaeology, GSP-1, Lomonosovsky Prospekt, 27-4, Moscow, 119991, Russia;2. Institute of Geoecology RAS, Ulansky per., 13-2. Ab.145, Moscow, 101000, Russia;1. Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory 1-12, 119234 Moscow, Russia;2. State Oceanographic Institute, Kropotkinsky Lane 6, 119034 Moscow, Russia;3. Laboratory of Genetics, Wageningen University, Droevendaalsesteeg 1, 6708PB Wageningen, the Netherlands |
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| Abstract: | Land use change in the American West has altered sagebrush dominated ecosystems, facilitating exotic grass invasion, increased woody species, altered fire regimes, and native species losses. Restoring fire regimes may be integral to the restoration of sagebrush ecosystems. However, little is known about how the timing of prescribed fire differentially impacts the soil seedbank. Further, sites of different ecological condition may variably respond to fire. To address these uncertainties, we quantified germination of invasive cheatgrass and plant functional groups (native dicots, exotic dicots, native bunchgrasses, and native shrubs) following spring and fall prescribed burns in three mountain big sagebrush communities at Lava Beds National Monument, California. At cheatgrass and native-dominated sites, there were fewer cheatgrass seedlings (91% and 86%, respectively) immediately following spring fire than in unburned controls, but this reduction did not persist one year later. Fall burns did not significantly impact cheatgrass or exotic dicot germination. At a native dominated site, native dicots increased one year following spring (1620%) and fall burns (67%), suggesting adaptation to a natural fire regime. This research shows that the prefire condition of an ecosystem greatly influences the postfire germination response, and that fire-adapted ecosystems can benefit from the natural disturbance regime. |
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| Keywords: | Fire ecology Invasive species Sagebrush restoration |
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